When I use slingbox on my android in the car and watch video (either parked, or another person uses), going through bluetooth makes the audio almost a second in delay. I guess that is processing time for bluetooth in my 2015 Honda Accord Hybrid. A delay is similar using Bluetooth headphone. Of course, using headphone jack syncs just right. But MORE new cell phone are coming out with NO headphone jack.
Please, consider adding a "variable video delay for sync to sound" feature. Otherwise, I wonder if this app will get used less and less with bluetooth, which is quite pervasive.